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Publication numberUS4982441 A
Publication typeGrant
Application numberUS 07/298,977
Publication dateJan 1, 1991
Filing dateJan 19, 1989
Priority dateJun 23, 1984
Fee statusPaid
Also published asUS4850030, US4977608, WO1986000481A1
Publication number07298977, 298977, US 4982441 A, US 4982441A, US-A-4982441, US4982441 A, US4982441A
InventorsHiroyuki Hashimoto, Nobuo Iizuka, Akira Suzuki
Original AssigneeTrio Kabushiki Kenwood
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Radio communication system
US 4982441 A
Abstract
In the radio communication system for performing a communication in the idle channel selected from a plurality of frequency channels, the originating call station transmits the station identification code to specify the distant station together with the idle channel data to be actually communicated, and the distant station designated by the station identification code shifts to the designated idle channel, and the communication is executed between two stations. During communication in a certain channel between two stations, in the case where a radio interference occurs in this channel and it is intended to shift to other channel, one station transmits the other channel data in the communication channel and the other station receives it, and the communication is continued each other in the other channel.
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Claims(1)
We claim:
1. A transceiver comprising:
transmitting receiving means for conducting a communication in an operation channel;
a transmission switch manually operable for generating a transmission instruction;
means for manually generating an originating call instruction;
means in response to the originating call instruction for periodically examining the idle/busy condition of a call channel and upon an examination result of idle activating said transmitting/receiving means to transmit the originating call data including a selected communication channel in the call channel as an originating call procedure;
means for shifting the operation channel of said transmitting/receiving means from the call channel to the selected communication channel after the originating call data transmission; and
means in response to the transmission instruction for activating said transmitting/receiving means to transmit a message and in response to the transmission instruction generated during the call channel condition examination for activating said transmitting/receiving means to transmit the originating call data in the call channel, regardless of the examination result.
Description

This is a divisional application of Ser. No. 07/113,355, filed Oct. 28, 1987, now U.S. Pat. No. 4,850,030.

TECHNICAL FIELD

The present invention relates to a radio communication system and, more particularly, to an amateur radio communication system.

BACKGROUD ART

of an amateur

The conventional FM communication radio station is generally based on a method whereby the idle frequency (idle channel) is found out from the calling frequencies (calling channels) and this idle frequency is informed by a voice to unspecified distant stations and the mutual stations which desire the communication shift to this idle frequency and perform the communication. These operations are manually performed.

DISCLOSURE OF INVENTION

According to this system, a series of those operations are automated by the digital technology in the following manner. The idle channel is automatically found out. An instruction signal to perform the operation to shift the frequency of the radio transceiver on the distant side to the idle channel is transmitted from this side and at the same time, this side also promptly shifts the frequency to this idle channel. However, since the calling channel is used by many stations and the signal to instruct the channel shift is unnecessary for the other unconcerned stations, a digital control code to specify the distant stations, a digital control code to specify the distant station to be communicated with this station is set (this digital control code consists of arbitrary five-digit number to mutually identify the objective stations to be communicated and is what is called a "password" which is arbitrarily determined among fellows, "employee code", "position code", or the like). The instruction signal to shift to the idle channel is sent to only the station which transmitted the coincident digital control code. Then, both of the distant station and this station shift to the idle channel and can perform the communication.

The radio transceiver used in this system and disclosed as an embodiment also has the following functions.

The function (skip channel) to avoid the channels (frequencies) which were preliminarily stored in a memory of the radio transceiver and to select the channels other than those stored channels when the idle channel is found out. With this function, it is possible to avoid the shift to a channel which is perhaps busy, such as a club channel or the like.

The function to select the idle channel from among a plurality of channels (frequencies) which were preliminarily stored in a memory of the radio transceiver when the idle channel is searched. With this function, it is easy to shift to the channel which is frequency used by this side.

The function in which although the line was automatically connected and the communication was performed, this channel soon becomes difficult to be used in the best condition due to radio interference or the like, so that the line is automatically connected to another idle channel from that channel. With this function, in the case where the control channel is set to the special channel, the communication is concentrated to this channel; therefore, by setting the current communicating channel to the start channel, the communication jam can be avoided. If the radio interference occurred during communication, in the case where the setting of the control channel which can shift to the idle channel from that frequency to the special channel (for example, call channel) is not admitted, this function is effective as a countermeasure for such a case.

The function (reverse) to alternately shift the calling channel and the selected idle channel. With this function, in the case where the distant station cannot be connected at the time of the channel link, the channel can be returned to the start channel and the channel shift operation can be again performed. The channels can be easily manually switched and it is possible to manually shift to the idle channel for the distant station which is not provided with the apparatus according to this system.

The function in which although the digital code which was set to call the distant side is apparently the code by which this side is called upon reception, this side can be also called even by (a plurality of) the other codes stored in the memory of the radio transceiver on this side. There is a generality in the case where the station is called by a plurality of codes rather than the case where it is called by one group code (this function is convenient when there are a plurality of group code stations which are determined for a plurality of club stations; the waiting and calling of a plurality of stations can be performed).

The function in which the transmission can be executed only in the state in which the code squelch (the function such that the voice of the distant station can be heard only when the code number set on this side coincides with the code number set in the distant station) is set upon reception and when a transmission switch (PTT switch) is pressed to transmit, the squelch is first cancelled and all can be received. With this function, it is possible to promptly cancel the channel at hand and the use state of this channel can be certainly confirmed before transmission. Unless the code squelch is cancelled, the voice of the station of the group code or conventional set cannot be heard.

The common use as the switch for the call operation and the switch for the recall operation which is used in the case where the line of the distant station cannot be automatically connected by the call operation, or the like. The common use of the switches in this way can reduce the number of switches. Although the actual originating call operation and reoriginating call operation differ, both of these operations are the calling operations for the user; therefore, the operations are simplified by using the same switch for those operations.

The function in which when the idle channel is being searched, the execution of this operation is displayed by a light, sound, or the like. With this function, it is possible to clarify that the idle channel is being searched.

The function in which when an arbitrary call sign (of a radio station to be used) for automatic transmission of the call sign is set, alphabets are replaced by numerals of two digits and can be inputted by a keyboard switch to set the digital code. According to the method whereby alphabetic characters and numerals are directly inputted or the method whereby they are inputted by the hexadecimal ASCII code, many keys are needed and the display corresponding thereto must be performed. However, by converting into the decimal ASCII code, it is sufficient to use only numerals of 0 to 9 and the display can also become easy.

The function in that the transmission can be performed only when the call sign for automatic transmission of the call sign is inputted. With this function, it is possible to prevent the originating call in the case where the input of the call sign code of this station was forgot.

The function in which the call sign which was automatically transmitted from the distant station is received and interpreted and the call sign is displayed by the display device. The data which is sent as the ASCII code can be observed as the call sign by the eyes and the distant station can be momentarily identified.

The lock function in which when the display representing that the line is connected to the distant station is indicated, even if this station is called from another station having the same digital code, the line is not connected to this another station (the line is still connected to the station to which the line was first connected). With this function, it is possible to cope with the interference of reception.

The function to store the frequency of the channel to be locked.

The function to forcedly stop the search of the idle channel. Unless the idle channel is found out, the program of the apparatus enters the infinite loop; therefore, this is cancelled at a proper timing.

The function in which although the transmission cannot be performed ordinarily when no idle channel is found out, the transmission can be forcedly executed. When it is difficult to expect that the control or originating call channel becomes idle, the control signal can be transmitted sometimes.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram showing an example of a fundamental arrangement of a radio transceiver which is used in the system of the present invention;

FIG. 2 is a diagram showing an example of an arrangement of a control signal according to the system of the invention;

FIG. 3 is a diagram showing a procedure for the operation to connect the idle channel in the radio transceiver of the invention;

FIG. 4 is a diagram showing a procedure for the code squelch operation of the radio transceiver of the invention;

FIG. 5A-C are a circuit diagram showing an arrangement of an embodiment of the radio transceiver of the invention; and

FIGS. 6A-C to 8-4C are flowcharts showing the operation of the embodiment of the radio transceiver shown in FIG. 5.

DETAILED DESCRIPTION OF THE EMBODIMENT

FIG. 1 shows an example of a fundamental arrangement of a radio transceiver for use in the present system. The input/output processes and general functions of the transceiver are controlled by a main computer 1. The data process is executed by a subcomputer 2. In a modem 3 for data transmission of the MSK (Minimum Shift Keying) system, a modulator section outputs an MSK signal while synchronizing a data signal necessary for transmission with a clock as an interface of the digital data process. A demodulator section demodulates the data signal from the MSK signal received and also reproduces the clock synchronized with the data signal. A signal to operate the transceiver is inputted from a keyboard 4 and the operation state of the transceiver is displayed on a display 5.

FIG. 2 shows an example of an arrangement of a control signal to transmit the necessary information to the distant station which is used in the present system. The data information in this signal is particularly important and uses error correction based on the Hargelbarger system, thereby improving errors due to the influence by the noise or the like.

(1) Bit/frame sync signal . . . Discriminates the noise and signal upon data communication or the like from the signal for the present system.

(2) Digital code data . . . The number which is constituted by numerals of five digits and is used to identify whether the station is the objective distant station or not. (3) Idle channel data . . . The frequency data of the idle channel and the information data from 100 MHz to 1 kHz. (4) Call sign data . . . The information data of six characters of the call sign in combination of numerals and alphabets. The spare data is also provided in consideration of future development of the system. This control signal is transmitted at a high speed of 1200 baud, so that its transmission time is so short to be about 0.2 second and will hardly influence on the ordinary communication. However, when this signal is received, it is heard as a peculiar sound like "piro piro".

As an example of setting the digital code and inputting the call sign, the digital code assumes the number of five digits by sequentially setting numerals of 0 to 9. The call sign is inputted using the ASCII code by expressing it as the decimal number instead of the hexadecimal number of two digits so that it can be easily inputted. The following table shows the correspondence among the codes which are expressed by decimal number and the characters which are expressed by these codes. For example, although a character of "J" is expressed as &H4A by the ASCII code, it is expressed as 74={416+A(10)} by the decimal number. This code is converted to the ASCII code in the set and is transmitted.

              TABLE______________________________________A:65       B:66      C:67         D:68E:69       F:70      G:71         H:72I:73       J:74      K:75         L:76M:77       N:78      O:79         P:80Q:81       R:82      S:83         T:84U:85       V:86      W:87         X:88Y:89       Z:90      SPACE:320:48       1:49      2:50         3:514:52       5:53      6:54         7:558:56       9:57______________________________________

The connecting operation to the idle channel is performed in accordance with a procedure as shown in FIG. 3. In the originating call station, the idle channel is searched at random on a 20-kHz step basis in the usable band (the band of 144 MHz or 430 MHz) of the FM radio wave, but the calling frequency of the band and the frequency designated as the skip channel are eliminated. For discrimination of the idle channel, the channel is decided to be idle when the level of the received signal of that frequency channel is below a threshold value for a predetermined time or longer.

The automatic transmitting operation (for about 0.2 second) in the case of transmitting the control signal is executed by first checking the idle state by that frequency and then waiting until the station becomes idle if a radio wave is transmitted. In such a case, the apparatus is in the reception monitoring state. Therefore, the forced transmission due to the PTT can be performed in accordance with the situation. The search of the idle channel can be cancelled as well by pressing the PTT.

FIG. 4 shows an example of a procedure for the code squelch operation. No transmission is performed when the PTT (Push to Talk) switch is pressed in the code squelch state, but the code squelch operation is cancelled. This is because the monitor has a priority.

The operation of an embodiment of the present invention will be described hereinbelow with reference to flowcharts shown in FIGS. 6 to 8.

First, when the amateur radio transceiver of the present invention is made operative, it enters the receiving state unless otherwise a special operation is performed.

When the program is started, a check is made to see if the setting of the call sign code has been selected by code selecting means 101 or not (step a1) The code selecting means 101 can designate the setting of the call sign code and set codes A and B. As will be explained hereinafter, when the setting of the call sign code is instructed, the code selecting means 101 can be controlled to the setting state of the set code A by a signal from a microcomputer 80. Although the set codes A and B are indicated as the set code so that they can also function as what are called group codes and also as the codes for code squelch, they are indicated as the group codes A and B hereinbelow.

The call sign code and the like are set by code setting means 102. Therefore, for example, one character of the ASCII code is instructed by pressing the code setting means 102 four times and it is assumed that the hexadecimal number corresponding to high order three bits of the ASCII code of seven units to which the value indicated by the code setting means 102 due to the depression of the first two times was added and the hexadecimal number corresponding to low order four bits of the ASCII code of seven units to which the value indicated by the code setting means 102 due to the depression of the next two times was added are shown, respectively.

In step a1, when the setting of the call sign code is selected, a second count area (hereinafter, a count area is referred to as a counter) 104 provided in a RAM 83 is cleared (step a2) to set the number of digits of the call sign. Then, a first counter 103 provided in the RAM 83 is cleared (step a3) to count in order to allow the number of depression times of the code setting means 102 depressed to correspond to one character of the ASCII code. Then, a key switch output supplied from the code setting means 102 is loaded into call sign code operating means 106 (step a4) to add the above-mentioned value due to the depression of two times in order to convert into the ASCII code. Then, the first counter is increased by "+1" (step a5), Steps a4 to a5 are repeated by the number of times corresponding to one character of the ASCII code (step a6). The input code is then converted into the ASCII code (step a7). The converted ASCII code is stored into call sign code memory area 107 provided in the RAM 83 and the memory content is displayed in a call sign display device 114 through code operating means 113 (step a8). Then, the second counter 104 is increased by "+1" (step a9). Steps a3 to a9 are repeated by the number of times corresponding to the number of digits of the call sign (step a10). When the count value of the second counter 104 becomes the value corresponding to the number of digits of the call sign in step a10, the call sign code is completely stored into the call sign code memory area 107 and a flag is set into call sign code set state memory area 108 provided in the RAM 83 (step a11). Then, the call sign code selection by the code selecting means 101 is cancelled and the position to set the group code A is selected (step a12).

Subsequent to step a12, a check is made to see if the setting of the group codes has been selected by the code selecting means 101 or not (step a13).

In this embodiment, the case where two group codes of (A) and (B) can be set has been shown as an example; however, it is not limited to two group codes.

When the selection of the call sign code is not selected in step a1, step a13 is executed after step a1.

When the setting of group codes is selected in step a13, a third counter 105 which is provided in the RAM 83 and counts the number of digits of the group code is cleared (step a14). A check is made to see if the selected group code is the group code (A) or not (step a15). When it is detected in step a15 that the group code (A) has been selected, the input code is loaded into a first group code memory area 109 provided in the RAM 83 (step a16). The third counter 105 is increased by "+1" (step a17). The set group code (A) is displayed in a data display device 112 through data display selecting means 111 (step a18). After step a18, steps a16 to a18 are repeated until the count value of the third counter 105 becomes the number of digits of the group code, and when the count value of the third counter 105 becomes the number of digits of the group code (step a19), step a13 is then executed. Thus, the set group code (A) is stored into the first group code memory area 109.

When the selected group code is not the group code (A) in step a15, it is the group code (B). In this case, steps a20 to a23 are executed in a similar manner to steps a16 to a19 after step a15. Thus, the set group code (B) is stored into second group code memory area 110 provided in the RAM 83.

When the setting of the group codes is not selected in step a13, a check is made to see if the group code (A) has been selected by group code selecting means 115 or not in order to use the group code (A) for waiting (step a24). When the group code (A) is selected by the group code selecting means 115, a check is made to see if the group code (A) has been stored into the first group code memory area 109 or not (step a25).

When the group code (A) has been stored into the first group code memory area 109 in step a25, a flag in a group code (A) selection permitting memory area 116 provided in the RAM 83 is inverted (step a26). When the flag in the group code (A) selection permitting memory area 116 was set in step a26, the set group code (A) is displayed in the data display device 112 together with the special indication such as, for example, a decimal point (step a27). When the flag in the group code (A) selection permitting memory area 116 was reset in step a26, the special indication such as, e.g., a decimal point is lit off and the set group code (A) is displayed in the data display device 112 (step a27).

A check is then made to see if the group code (B) has been selected by the group code selecting means 115 or not in order to use the group code (B) for waiting (step a28).

When the group code (A) is not selected in step a24, and when the group code (A) is not set in step a25, step a28 is executed subsequent to steps a24 and a25.

When the group code (B) is selected in step a28, a check is made to see if the group code (B) has been stored into the second group code memory area 110 or not (step a29) in a manner similar to step a25.

When the group code (B) has been stored in the second group code memory area 110 in step a29, a flag in a group code (B) selection permitting memory area 117 provided in the RAM 83 is inverted (step a30). When the flag in the group code (B) selection permitting memory area 117 was set in step a30, the set group code (B) is displayed in the data display device 112 together with the special indication such as, e.g., a decimal point (step a31). When the flag in the group code (B) selection permitting memory area 117 was reset in step a30, the special indication such as, e.g., a decimal point is lit off and the set group code (B) is displayed in the data display device 112 (step a31) In addition, it will be obvious from steps a24 to a30 that both of the group codes (A) and (B) can be selected.

The originating call routine is executed after step a31. On the contrary, when the group code (B) is not selected in step a28, and when the group code (B) is not set in step a29, the originating call routine is executed subsequent to steps a28 and a29.

As will be apparent from the above description, the call sign code and the group codes (A) and (B) can be set. On the other hand, even when the group codes (A) and (B) were set and stored, if they are not selected in steps a24 and a28, they are not used for waiting or the like.

The originating call routine will then be described on the basis of FIG. 7.

In the originating call routine, a check is made to see if system operation state setting means 118 to designate whether the line of the transceiver is automatically connected to the distant transceiver or not has been set or not (step b1). When the system operation state setting means 118 is not set in step b1, the originating call routine is skipped and the transmission/reception routine, which will be explained hereinafter, is executed. When the system operation state setting means 118 has been set in step b1, a check is made to see if originating call setting means 119 has been set or not (step b2) after step b1. When the originating call setting means 119 is not set in step b2, the originating call routine is skipped and the transmission/reception routine is executed. When the originating call setting means 119 has been set in step b2, a check is made to see if the call sign has been set or not (step b3) after step b2. The setting of the call sign is detected by checking whether a flag is set in the call sign code set state memory area 108 or not. When the call sign is not set in step b3, the originating call routine is skipped and the transmission/reception routine is executed. Therefore, when the call sign is not set, the apparatus doesn't enter the originating call state and is not linked to the distant side. However, no problem occurs in the system even if the call sign is not set.

When the call sign is set in step b3, muting means 120 is made operative, namely, it is set into the mute-on state (step b4) after step b3. Since the muting is performed in step b4, when the idle line is being searched, the apparatus enters the receiving state, but the voice is muted. A check is then made to see if the line has been connected or not (step b5) after step b3. The connection of the line is detected by checking whether or not a flag was set into line connection memory area 121 provided in the RAM 83. When the line was connected in step b5, the apparatus enters the reoriginating call state, which will be explained hereinafter. This state is caused by executing the originating call routine a least once.

When the line is not connected in step b5, the frequency data stored in frequency data memory area 122 provided in the RAM 83 is loaded into a start channel data memory area (hereinafter, referred to as an S channel data memory area) 123 provided in the RAM 83 (step b6). The frequency data determined between this side and the distant side to be communicated before step b6 is set in the frequency data memory area 122 by frequency data setting means 124 consisting of a rotary encoder or the like. This set data is stored into the frequency data memory area 122.

Subsequent to step b6, the waiting state is inhibited (step b7). The waiting state is inhibited by resetting the flag in waiting state memory area 125 provided in the RAM 83. After step b7, an idle channel search display device 126 is lit on, thereby indicating that the idle channel is being searched (step b8). The idle channel may be indicated by a voice (e.g., a beep sound) as well as by the light.

On one hand, a check is made (step b9) to see if priority selection state setting means 129 to preferentially select, as the communication channels, the frequency data, for example, f1 and f2 which were preliminarily individually set into an f1 data memory area 127 and an f2 data memory area 128 provided in the RAM 83 has been set or not. When the priority selection state has been set in step b9, the frequency data f1 is loaded into the frequency data memory area 122 (step b10) and a first timer 130 starts timing (step b11). An output frequency of a frequency synthesizer 5 is set by the frequency data stored in the frequency data memory area 122. Therefore, the receiving frequency (upon reception) and the transmitting frequency (upon transmission) are set. After step b11, a check is made by idle channel detecting means 132 consisting of a comparator 39 to see if the received signal of the frequency corresponding to the f1 frequency data loaded in the frequency data memory area 122 is below a predetermined level or not (step b12). A check is made to see if the level of the received signal has been held at a level below the predetermined level for a set time of the first timer 130 or not (step b13). When the received signal level in step b12 has been held at a level below the predetermined level for the set time of the first timer 130 in step b13, it is determined that the frequency corresponding to the f1 frequency data is the idle line and step b27, which will be explained hereinafter, is executed.

On the contrary, when the received signal level exceeds the predetermined level in step b12, or when the state in that the received signal level is below the predetermined level doesn't continue for the set time of the first timer 130 in step b13, the frequency data f2 is loaded into the frequency data memory area 122 (step b14) after step b12. The first timer 130 starts timing (step b15). After step b15, a check is made to see if the received signal of the frequency corresponding to the f2 frequency data loaded in the frequency data memory area 122 is below a predetermined level or not (step b16). A check is then made to see if the received signal level has been held at a level below the predetermined level for the set time of the first timer 130 or not (step b17). When the received signal level in step b16 has been held at the level below the predetermined level for the set time of the first timer in step b17, it is determined that the frequency corresponding to the f2 frequency data is the idle line and step b27, which will be explained hereinafter, is executed On the contrary, when the received signal level exceeds the predetermined level in step b16, or when the state in that the received signal level is below the predetermined level does not continue for the set time of the first timer 130 in step b17, the frequency data generated in random frequency generating means 133 is loaded into the frequency data memory area 122 (step b18) after step b16. Then, the frequency data stored in the frequency data memory area 122 is increased (step b19).

When the priority selection state setting means 129 is not set in step b9, step b18 is executed after step b9. In this case, the selection with respect to whether the frequency data is preferentially selected or not is not selected.

After step b19, a check is made to see if selective exclusion state setting means 134 to exclude that the frequency data, for example, f3 and f4 which were preliminarily individually set into an f3 data memory area (not shown) and an f4 data memory area (not shown) provided in the RAM 83 are selected as the communication channels has been set or not (step b20). When the selective exclusion state was set in step b20, a check is made to see if the frequency data stored in the frequency data memory area 122 coincides with the frequency data f3 or not by frequency data comparing means 138 (step b21). When the frequency data stored in the frequency data memory area 122 is not the frequency data f3 in step b21, a check is then made to see if it coincides with the frequency data f4 or not in a manner similar to the above (step b22). When the frequency data stored in the frequency data memory area 122 is not the frequency data f4 in step b22, a check is made to see if the frequency corresponding to the frequency data stored in the frequency data memory area 122 is the frequency in the amateur band stored in a frequency data memory area 135 within a set range provided in the RAM 83 or not (step b23) subsequent to step b22. When step b23 is executed through steps b21 and b22, the frequency data stored in the frequency data memory area 122 doesn't correspond to the frequency to be selectively excluded in step b19.

When the selective exclusion state setting means 134 is not set in step b20, step b23 is executed subsequent to step b20. In this case, the discrimination regarding the frequency data to be selectively excluded is not carried out.

When the frequency corresponding to the frequency data stored in the frequency data memory area 122 is the frequency in the amateur band in step b23, the first timer 130 starts timing (step b24). A check is then made to see if the received signal level is below a predetermined level or not (step b25). A check is made to see if the received signal level has been held at a level below the predetermined level for the set time of the first timer 130 or not (step b26).

When the state in that the received signal level is below the predetermined level doesn't continue for the set time of the first timer 130 in step b26, a check is made to see if a PTT switch 14 has been turned on or not (step bx). When the PTT switch 14 is not ON, a check is made to see if a reset switch 139 has been turned on or not (step by) When the PTT switch 14 is ON in step bx, and when the reset switch 139 is ON in step by, this means that the stop of the originating call is instructed. In this case, the frequency data stored in the S channel data memory area 123 is loaded in the frequency data memory area 122 (step b34) after steps bx and by. Then, step b51, which will be explained hereinafter, is executed.

When the reset switch 139 is not ON in step by, a check is again made to see if the received signal level is below the predetermined level or not (step b25).

When the received signal has been held at the level below the predetermined level for the set time of the first timer 130 in step b26, the frequency corresponding to the frequency data stored in the frequency data memory area 122 is the idle line in step b19. On one hand, after step b26, the frequency data stored in the frequency data memory area 122 is loaded in an idle channel data memory area 136 provided in the RAM 83 (step b27). The frequency data stored in the S channel data memory area 123 is loaded in the frequency data memory area 122 (step b28) after step b27.

When step b28 is executed through step b13 or step b17, the frequency data f1 or f2 is stored in the idle channel data memory area 136. When step b28 is executed through steps b20 to b27, the frequency data which is stored in the idle channel data memory area 136 is not the frequency data f3 and f4. When step b28 is executed through step b5, on one hand, the frequency data stored in the S channel data memory area 123 is again loaded into the frequency data memory area 122 in step b28 in the state in that line was connected. This means the reoriginating call.

Subsequent to step b28, a check is made to see if the received signal level of the frequency corresponding to the frequency data loaded in the frequency data memory area 122 is below a predetermined level or not (step b29). When it exceeds the predetermined level, a check is made to see if the PTT switch 14 has been turned on or not (step b30). When the PTT switch 14 is ON in step b30, and when the received signal level is below the predetermined level in step b29, it is determined that the search of the idle line has been finished, and the idle channel search display device 126 is lit off (step b31). When step b31 is executed through step b30, the received signal level is over the predetermined value; however, the originating call is forcedly performed. The detection in step b29 to see if the received signal level is below the predetermined level or not is performed in order to confirm whether the start channel is the idle line or not at this time.

When the frequency data stored in the frequency data memory area 122 coincides with the frequency data f3 or with the frequency data f4 or when it corresponds to the frequency out of the amateur band in steps b21, b22, and b23, or when the received signal level exceeds the predetermined level in step b25, a check is made to see if the PTT switch 14 is ON or not (step b32) subsequent to steps b21, b22, b23, and b25. When the PTT switch 14 is not ON, a check is made to see if the reset switch 139 has been turned on or not (step b33). When the reset switch 139 is OFF in step b33, step b19 is executed after step b33.

When the PTT switch 14 in ON in step b32, and when the reset switch 139 is ON in step b33, the stop of the originating call is instructed. The frequency data stored in the S channel data memory area 123 is loaded into the frequency data memory area 122 (step b34) after steps b32 and b33 and step b51, which will be explained hereinafter, is executed. When the PTT switch 14 is not ON in step b30, a check is made to see if the reset switch 139 has been turned on or not (step b35) after step b30. When the reset switch 139 is not ON, step b29 is executed after step b35. When the reset switch 139 is ON in step b35, the stop of the originating call is instructed and step b51, which will be explained hereinafter, is executed after step b35.

After step b31, the frequency data stored in the idle channel data memory area 136 is loaded into output data encoding means 141 (step b36). Then, the group code (A) selected by the code selecting means 101 is loaded into the output data encoding means 141 (step b37). Further, the call sign data stored in the call sign code memory area 107 is loaded into the output data encoding means 141 (step b38). Next, the data loaded in the output data encoding means 141 is encoded into, for example, the Hargelbarger code (step b39). Therefore, the call sign code, group code, and idle channel frequency data are encoded in step b37.

After step b39, the transmitting section 2 is set into the data transmission mode, namely, the output which is derived by converting an output of the output encoding means 141 by a parallel/serial converting means 40 is supplied to the transmitting section (step b60). In the transceiver, transmission/reception switching means 6 is set into the transmission mode (step b41) and the sync data generated from a sync data generator 144 is then transmitted (step b42). After step b42, the output data encoded in step b39 is then transmitted (step b43). Therefore, by executing step b43, what is called an originating call in which the frequency corresponding to the S channel frequency data is modulated by the data including the idle channel frequency data and is transmitted is carried out.

After step b43, the transmission mode is cancelled and the transmission/reception switching means 6 is reset to the reception mode (step b44). Further, the data transmission mode is cancelled (step b45) and the frequency data stored in the idle channel data memory area 136 is loaded into the frequency data memory area 122 (step b46). Thus, the transceiver is set to the idle channel receiving frequency searched and is set to the waiting state of the transmission from the distant side. After step b46, the frequency corresponding to the frequency data stored in the idle channel data memory area 136 is displayed in the data display device 112 (step b47). After step b47, a flag is set into the line connection memory data 121 (step b48). In step b48, the line is forcedly connected to the reception side on the transmission side. After step b48, a line connection display device 146 is lit on (step b49). After side b49, a third timer 147 starts timing (step b50). The set time of the third timer 147 is set to the time assuming that the line is not connected when nothing is inputted from the distant side within this set time.

After step b50, a flag in a reverse state memory area 149 provided in the RAM 83 is reset in order to store the output state of reverse state setting means 148 (step b51). The reverse state memory area 149 represents whether the frequency data stored in the frequency data memory area 122 is the frequency data corresponding to the idle channel or the frequency data corresponding to the S channel.

After step b51, the flag in the waiting state memory area 125 is set and the inhibition of the waiting state is cancelled (step b52). Then, a check is made to see if the code squelch has been set by code squelch setting means 150 or not (step b53). When no code squelch is set in step b53, the muting by the muting means 120 is cancelled (step b54) after step b53 and the transmission/reception routine is executed. In this state, the frequency corresponding to the idle channel frequency data can be received. When the code squelch has been set in step b53, a code squelch display device 151 is lit on (step b56) after step b53 and then the transmission/reception routine is executed. Since the muted state is maintained in this state, the reception cannot be performed.

On the other hand, when step b51 is executed after steps b34 and b35, this means that steps b26 to b50 and steps b31 to b50 were skipped and indicates the case where the search of the idle channel was forcedly cancelled and the originating call was forcedly stopped.

The transmission/reception routine will then be described with reference to FIG. 8.

When the transmission/reception routine is started, a check is made to see if the PTT switch 14 has been turned on or not (step c1). When the PTT switch 14 is ON in step c1, a check is made to see if the code squelch has been set or not (step c2). When the code squelch has been set in step c2, the setting of the code squelch is cancelled (step c3). The code squelch display device 151 is then lit off (step c4). The muting by the muting means 120 is cancelled (step c5). Thereafter, the transmission/reception routine is finished and the processing routine is returned to "START".

When steps c1 to c5 are executed, the reception can be performed by turning off the PTT switch 14.

When the code squelch isn't set in step c2, a check is made to see if the system operation state setting means 118 has been set or not (step c.sub. 6) in a manner similar to step b1 after step c2. When the system operation state setting means 118 is not set in step c6, the apparatus is set into the transmitting mode (step c7). A check is then made to see if the PTT switch 14 has been turned on or not (step c8). When the PTT switch 14 is ON in step c8, step c7 is executed. Therefore, when the PTT switch 14 is ON in step c8, the transmission is continued until the PTT switch 14 is turned off in step c8. In this case, the transmission in the case by the conventional amateur radio transceiver is carried out instead of the transmission under the system operating state. When the PTT switch 14 is OFF in step c8, the transmitting mode is cancelled (step c9) and the transmission/reception routine is ended and the processing routine is returned to "START".

When the system operation state setting means 118 has been set in step c6, after step c6, the special frequency data which was preset into a special frequency data memory area 152 provided in the RAM 83 and corresponds to the frequency out of the amateur band is loaded into the output data encoding means 141 in place of the frequency data stored into the idle channel data memory area 136 (step c10). Next, the group code (A) is loaded into the output data encoding means 141 (step c11). Further, the call sign data stored in the call sign code memory area 107 is loaded into the output data encoding means 141 (step c12) and is encoded by the output data encoding means 141 (step c13).

After step c13, the transmitting section 2 is set into the data transmitting mode (step c14) and the transceiver is set into the transmitting mode (step c15). The sync data is transmitted (step c16) and the output data encoded in step c13 is then transmitted (step c17). The data transmitting mode is cancelled due to the end of transmission (step c18). The frequency data which was preset into the special frequency data memory area 152 is encoded in place of the idle channel data and transmitted at the frequency corresponding to the frequency data stored in the frequency data memory area due to steps c10 to c17. On the distant side which received this transmission, the code squelch is cancelled as will be explained hereinafter.

The transmission can be performed due to the completion of the execution of step c18. After step c18, a second timer 153 starts timing (step c19) After step c19, a check is made to see if the PTT switch 14 is OFF or not (step c20). When the PTT switch 14 is not OFF, the apparatus waits until a set time of the second timer 153 elapses (step c21). When the set time of the second timer 153 has elapsed in step c21, the apparatus is set into the data transmitting mode in a manner similar to step c14 (step c22). The sync data is transmitted (step c23). The output data which is derived by encoding the frequency data, as the idle channel data, stored in the special channel data memory area 152 in step b36 is transmitted (step c24). The data transmitting mode is cancelled (step c25). The third timer 147 starts timing (step c26). Then, step c19 is again executed. Therefore, due to steps c19 to c26, each time the set period of the second timer 153 elapses, the transmission is temporarily interrupted and the transmission of the output data is repeated. While the transmission is being performed, the third timer 147 is reset due to step c26 and the timing operation of the third timer 147 is newly repeated.

When the PTT switch 14 is OFF in step c20, this means that there is no will of communication and in this state, the output data is transmitted (steps c27 to c30) after step c20 in a manner similar to steps c22 to c25. Then, the transmitting mode is cancelled (step c31). The third timer 147 starts timing (step c32). Thereafter, the transmission/reception routine is ended and the processing routine is returned to "START". Steps c2 to c32 correspond to the transmission routine.

When the PTT switch 14 is OFF in step c1, a check is made to see if the flag has been set into the line connection memory area 121 or not after step c1 (step c33). When the flag has been set in step c33, namely, when the line has been connected, a check is made to see if the reset switch 139 has been turned on or not (step c34) after step c33. When the reset switch 139 is OFF, namely, when it is not reset in step c34, a check is made to see if the input data exists or not (step c35) after step c34. As described above, in this embodiment, the apparatus is ordinarily in the receiving mode. When the output data from the distant side has been received in step c35, the input data is converted to the parallel data by a serial/parallel converting means 42 and decoded by input data decoding means 155 (step c36) after step c35. A check is then made to see if the group code (A) has been selected or not (step c37). When the group code (A) has been selected, a check is made to see if the group code in the input data coincides with the group code (A) or not by code comparing means 156 (step c38). When the group code (A) is not selected in step c37, or when the group code in the input data doesn't coincide with the group code (A) in step c38, a check is made to see if the group code (B) has been selected or not (step c39) after steps c37 and c38. When the group code (B) has been selected, a check is made to see if the group code in the input code coincides with the group code (B) or not (step c40). When the group code (B) is not selected in step c39, or when the group code in the input data doesn't coincide with the group code (B) in step c40, a check is made to see if the set time of the third timer 147 has elapsed or not (step c41) after steps c39 and c40. When no input data exists in step c35, step c41 is executed after step c35. As is obvious in steps c37 to c40, the waiting is performed by the group codes (A) and (B).

Therefore, when the reset is not instructed and no input data exists, and when the group code in the input data doesn't coincide with the group code in the selected state even if the input data exists, the muting by the muting means 120 is executed (step c42) after an expiration of the set time of the third timer 147. After step c42, the frequency data stored in the S channel data memory area 123 is loaded into the frequency data memory area 122 and the transceiver is set from the receiving mode of the idle channel frequency to the receiving mode of the frequency corresponding to the data (S channel data which was determined between this side and the distant side in step b6) stored in the S channel data memory area 123 (step c43). The flag in the reverse state memory area 148 is set (step c43 '). A check is then made to see if the code squelch has been set or not (step c44). When no code squelch is set, the muting by the muting means 120 is cancelled (step c45) and the flag in the line connection memory area 121 is reset (step c46). When the code squelch has been set in step c44, step c46 is executed after step c.sub. 44. The line connection display device 146 is lit off (step c47) after step c46. The transmission/reception routine is ended and the processing routine is returned to "START".

When the reset switch 139 is ON in step c34, namely, when the reset is instructed, step c46 is executed subsequent to step c34.

When the flag in the line connection memory area 121 has been reset in step c33, a check is made to see if the reverse state setting means 148 has been set or not (step c76). When the group code in the input data coincides with the group code (A) in step c38, or when the group code in the input data coincides with the group code (B) in step c40, the third timer 147 starts timing (step c75) after steps c38 and c40. Then, step c76 is executed. When the timing operation is started in step c75, the third timer is reset and restarts timing from the beginning.

When the reverse state setting means 148 has been set in step c76, the state of the flag in the reverse state memory area 149 is detected (step c48). When the flag in the reverse state memory area 149 has been set, the frequency data stored in the idle channel data memory area 136 is loaded into the frequency data memory area 122 (step c49). When the flag in the reverse state memory area 136 has been reset, the frequency data stored in the S channel data memory area 123 is loaded into the frequency data memory area 122 (step c50). The state of the flag in the reverse state memory area 136 is inverted (step c51) subsequent to steps c49 and c50. In step c48, when the flag in the reverse state memory area has been reset, the idle channel data is stored in the frequency data memory area 122. When the flag has been set, the S channel data is stored in the frequency data memory area 122. Due to the execution of steps c49 and c50, the memory content of the frequency data memory area 122 is replaced between the idle channel data and the S channel data. Therefore, if the distant side doesn't respond in spite of the fact that the line was connected from the transmission side, it is possible to detect whether or not the frequency was returned to the frequency corresponding to the S channel data or the like. On one hand, in step c51, the content of the reverse state memory area 149 is set to the state corresponding to the memory content (idle channel data or S channel data, of the frequency data memory area 122.

Subsequent to step c51, a check is made to see if the input data exists or not (step c52). When no input data exists, the transmission/reception routine is ended and the processing routine is returned to "START". When the reverse state setting means 148 is not set in step c76, step c52 is executed after step c76. When the input data exists in step c52, the input data is decoded (step c53). A check is then made to see if the group code (A) has been selected or not (step c54). When the group code (A) has been selected, a check is made to see if the group code in the input data coincides with the group code (A) or not (step c55). When the group code in the input data coincides with the group code (A) in step c55, the group code (A) is displayed in the data display means 112 (step c58). A check is then made to see if the apparatus has been set into the system operating state or not (step c60).

When the group code (A) is not selected in step c54, or when the group code in the input data doesn't coincide with the group code (A) in step c55, a check is made to see if the group code (B) has been selected or not (step c56) subsequent to steps c54 and c55. When the group code (B) has been selected, a check is made to see if the group code in the input data coincides with the group code (B) or not (step c57). When the group code in the input data coincides with the group code (B) in step c57, the group code (B) is displayed in the data display device 112 (step c59) after step c57. Step c60 is executed subsequent to steps c56 and c57. When the group code (B) is not selected in steps c56 and c57, or when the group code in the input data doesn't coincide with the group code (B), subsequent to steps c56 and c57, the transmission/reception routine is ended and the processing routine is returned to "START". A check is made in step c71 to see if the frequency data in the input data is the special data or not. When it is the special data, step c70 is executed after step c71. When it is not the special data, step c60 is executed.

When the apparatus has been set to the system operating state in step c60, a check is made to see if the frequency corresponding to the idle channel data in the input data is the frequency in the amateur band or not (step c61) after step c60. When the frequency corresponding to the idle channel data in the input data is not the frequency in the amateur band in step c61, the transmission/reception routine is ended subsequent to step c61 and the processing routine is returned to "START".

When the frequency corresponding to the idle channel data in the input data is the frequency in the amateur band in step c61, a check is made to see if the idle channel data in the input data coincides with the frequency data in an f5 data memory area (not shown) which is provided in the RAM 83 and in which the f5 frequency data corresponding to the frequency that should not be set into the receiving mode is stored (step c62) When they don't coincide, the state of the flag in the line connection memory area is detected (step c63) When they coincide, the transmission/reception routine is ended and the processing routine is returned to "START".

When the flag in the line connection memory area 121 has been reset in step c63, namely, when the line isn't connected, the frequency data in the frequency data memory area 122 is loaded into the S channel data memory area 123 (step c64). The idle channel frequency data in the input data is then loaded into the frequency data memory area 122 (step c65). Thus, the apparatus is set to the frequency corresponding to the idle channel data in the input data. The call sign in the input data is displayed in the data display device 112 (step c66) after step c65.

Subsequent to step c66, the flag in the reverse state memory area 149 is reset (step c67). The flag in the line connection memory area 121 is set (step c68). The line connection display device 146 is lit on (step cz). The third timer 147 starts timing (step c69).

Subsequent to step c69, a check is made to see if the code squelch has been set or not (step c70). When no code squelch is set, the transmission/reception routine is ended and the processing routine is returned to "START". When the flag in the line connection memory area 121 has been set in step c63, step c70 is executed after step c63. On one hand, when the apparatus is not set to the system operating state in step c60, the transmission/reception routine is ended and the processing routine is returned to "START".

When the code squelch has been set in step c70, the code squelch is cancelled (step c72) The code squelch display device 151 is lit off (step c73). The muting by the muting means 120 is cancelled (step c74). The transmission/reception routine is finished and the processing routine is returned to "START".

In the reception, the code squelch is cancelled and the muting is cancelled when the input data exists and the group code coincides with the group code transmitted and the apparatus is unrelated to the system operating state and also the idle channel frequency data in the input data is the special data, or when the input data exists and the group code coincides with the group code transmitted and the apparatus is in the system operating state and the frequency corresponding to the idle channel frequency data in the input data is the frequency in the amateur band and is not the frequency data corresponding to the frequency f5.

Steps c33 to c74 to c76 correspond to the reception routine.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5259021 *Mar 9, 1993Nov 2, 1993Motorola, Inc.Transmission of interconnection information for next generation cordless telephone networks
US5329530 *Oct 26, 1992Jul 12, 1994Nec CorporationRadio connection system
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Classifications
U.S. Classification455/516, 455/78, 455/517
International ClassificationH04B1/40, H04W4/10, H04W72/04
Cooperative ClassificationH04W4/10, H04W36/06, H04W76/005
European ClassificationH04W36/06
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